I logged on just after midnight game time today, to see the gates had shifted strangely. I've noticed similar things before but they always seem to fix themselves pretty quickly.
The icons had all shifted to the left, leaving the towers and colour-bar-thingy displays where they were.
Bird icon is now in front of the display for emerald rook gate, emerald rook icon is now in front of the display for copper knight gate, and so on.
Bird icon still has an open drop-box, and the number 1 on the elevator control panel.
You can access the emerald rook gate through the elevator with the emerald rook symbol on it. You can no longer access whichever gate was leftmost yesterday.
Attempting to add minerals to a dropbox adds them to the correct tower, i.e. one gate to the right. Adding minerals to the rightmost dropbox (purple clover) has no visible effect.
I believe the gates weren't supposed to shift at all today because the bird icon gate still had a day left?
e: Screenshot http://wiki.spiralknights.com/File:Gateshift.jpg
The gates rotate every two days (including last midnight), and the countdown represents the number of rotations rather than the number of days. It sounds like the displays (towers) aren't updating along with the monitors/control panels (at least not immediately; they seem fine now).